arch/x86/kvm/lapic.c

   1
   2 /*
   3  * Local APIC virtualization
   4  *
   5  * Copyright (C) 2006 Qumranet, Inc.
   6  * Copyright (C) 2007 Novell
   7  * Copyright (C) 2007 Intel
   8  *
   9  * Authors:
  10  *   Dor Laor <dor.laor@qumranet.com>
  11  *   Gregory Haskins <ghaskins@novell.com>
  12  *   Yaozu (Eddie) Dong <eddie.dong@intel.com>
  13  *
  14  * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
  15  *
  16  * This work is licensed under the terms of the GNU GPL, version 2.  See
  17  * the COPYING file in the top-level directory.
  18  */
  19
  20 #include <linux/kvm_host.h>
  21 #include <linux/kvm.h>
  22 #include <linux/mm.h>
  23 #include <linux/highmem.h>
  24 #include <linux/smp.h>
  25 #include <linux/hrtimer.h>
  26 #include <linux/io.h>
  27 #include <linux/module.h>
  28 #include <linux/math64.h>
  29 #include <asm/processor.h>
  30 #include <asm/msr.h>
  31 #include <asm/page.h>
  32 #include <asm/current.h>
  33 #include <asm/apicdef.h>
  34 #include <asm/atomic.h>
  35 #include "kvm_cache_regs.h"
  36 #include "irq.h"
  37
  38 #ifndef CONFIG_X86_64
  39 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
  40 #else
  41 #define mod_64(x, y) ((x) % (y))
  42 #endif
  43
  44 #define PRId64 "d"
  45 #define PRIx64 "llx"
  46 #define PRIu64 "u"
  47 #define PRIo64 "o"
  48
  49 #define APIC_BUS_CYCLE_NS 1
  50
  51 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  52 #define apic_debug(fmt, arg...)
  53
  54 #define APIC_LVT_NUM                    6
  55 /* 14 is the version for Xeon and Pentium 8.4.8*/
  56 #define APIC_VERSION                    (0x14UL | ((APIC_LVT_NUM - 1) << 16))
  57 #define LAPIC_MMIO_LENGTH               (1 << 12)
  58 /* followed define is not in apicdef.h */
  59 #define APIC_SHORT_MASK                 0xc0000
  60 #define APIC_DEST_NOSHORT               0x0
  61 #define APIC_DEST_MASK                  0x800
  62 #define MAX_APIC_VECTOR                 256
  63
  64 #define VEC_POS(v) ((v) & (32 - 1))
  65 #define REG_POS(v) (((v) >> 5) << 4)
  66
  67 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
  68 {
  69         return *((u32 *) (apic->regs + reg_off));
  70 }
  71
  72 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
  73 {
  74         *((u32 *) (apic->regs + reg_off)) = val;
  75 }
  76
  77 static inline int apic_test_and_set_vector(int vec, void *bitmap)
  78 {
  79         return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  80 }
  81
  82 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
  83 {
  84         return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  85 }
  86
  87 static inline void apic_set_vector(int vec, void *bitmap)
  88 {
  89         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  90 }
  91
  92 static inline void apic_clear_vector(int vec, void *bitmap)
  93 {
  94         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  95 }
  96
  97 static inline int apic_hw_enabled(struct kvm_lapic *apic)
  98 {
  99         return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
 100 }
 101
 102 static inline int  apic_sw_enabled(struct kvm_lapic *apic)
 103 {
 104         return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
 105 }
 106
 107 static inline int apic_enabled(struct kvm_lapic *apic)
 108 {
 109         return apic_sw_enabled(apic) && apic_hw_enabled(apic);
 110 }
 111
 112 #define LVT_MASK        \
 113         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
 114
 115 #define LINT_MASK       \
 116         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
 117          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
 118
 119 static inline int kvm_apic_id(struct kvm_lapic *apic)
 120 {
 121         return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
 122 }
 123
 124 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
 125 {
 126         return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
 127 }
 128
 129 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
 130 {
 131         return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
 132 }
 133
 134 static inline int apic_lvtt_period(struct kvm_lapic *apic)
 135 {
 136         return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
 137 }
 138
 139 static inline int apic_lvt_nmi_mode(u32 lvt_val)
 140 {
 141         return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
 142 }
 143
 144 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
 145         LVT_MASK | APIC_LVT_TIMER_PERIODIC,     /* LVTT */
 146         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
 147         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
 148         LINT_MASK, LINT_MASK,   /* LVT0-1 */
 149         LVT_MASK                /* LVTERR */
 150 };
 151
 152 static int find_highest_vector(void *bitmap)
 153 {
 154         u32 *word = bitmap;
 155         int word_offset = MAX_APIC_VECTOR >> 5;
 156
 157         while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
 158                 continue;
 159
 160         if (likely(!word_offset && !word[0]))
 161                 return -1;
 162         else
 163                 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
 164 }
 165
 166 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
 167 {
 168         return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
 169 }
 170
 171 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
 172 {
 173         apic_clear_vector(vec, apic->regs + APIC_IRR);
 174 }
 175
 176 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 177 {
 178         int result;
 179
 180         result = find_highest_vector(apic->regs + APIC_IRR);
 181         ASSERT(result == -1 || result >= 16);
 182
 183         return result;
 184 }
 185
 186 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 187 {
 188         struct kvm_lapic *apic = vcpu->arch.apic;
 189         int highest_irr;
 190
 191         if (!apic)
 192                 return 0;
 193         highest_irr = apic_find_highest_irr(apic);
 194
 195         return highest_irr;
 196 }
 197 EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
 198
 199 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 200                              int vector, int level, int trig_mode);
 201
 202 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
 203 {
 204         struct kvm_lapic *apic = vcpu->arch.apic;
 205
 206         return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
 207                         irq->level, irq->trig_mode);
 208 }
 209
 210 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
 211 {
 212         int result;
 213
 214         result = find_highest_vector(apic->regs + APIC_ISR);
 215         ASSERT(result == -1 || result >= 16);
 216
 217         return result;
 218 }
 219
 220 static void apic_update_ppr(struct kvm_lapic *apic)
 221 {
 222         u32 tpr, isrv, ppr;
 223         int isr;
 224
 225         tpr = apic_get_reg(apic, APIC_TASKPRI);
 226         isr = apic_find_highest_isr(apic);
 227         isrv = (isr != -1) ? isr : 0;
 228
 229         if ((tpr & 0xf0) >= (isrv & 0xf0))
 230                 ppr = tpr & 0xff;
 231         else
 232                 ppr = isrv & 0xf0;
 233
 234         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
 235                    apic, ppr, isr, isrv);
 236
 237         apic_set_reg(apic, APIC_PROCPRI, ppr);
 238 }
 239
 240 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 241 {
 242         apic_set_reg(apic, APIC_TASKPRI, tpr);
 243         apic_update_ppr(apic);
 244 }
 245
 246 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
 247 {
 248         return dest == 0xff || kvm_apic_id(apic) == dest;
 249 }
 250
 251 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
 252 {
 253         int result = 0;
 254         u8 logical_id;
 255
 256         logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
 257
 258         switch (apic_get_reg(apic, APIC_DFR)) {
 259         case APIC_DFR_FLAT:
 260                 if (logical_id & mda)
 261                         result = 1;
 262                 break;
 263         case APIC_DFR_CLUSTER:
 264                 if (((logical_id >> 4) == (mda >> 0x4))
 265                     && (logical_id & mda & 0xf))
 266                         result = 1;
 267                 break;
 268         default:
 269                 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
 270                        apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
 271                 break;
 272         }
 273
 274         return result;
 275 }
 276
 277 int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 278                            int short_hand, int dest, int dest_mode)
 279 {
 280         int result = 0;
 281         struct kvm_lapic *target = vcpu->arch.apic;
 282
 283         apic_debug("target %p, source %p, dest 0x%x, "
 284                    "dest_mode 0x%x, short_hand 0x%x\n",
 285                    target, source, dest, dest_mode, short_hand);
 286
 287         ASSERT(!target);
 288         switch (short_hand) {
 289         case APIC_DEST_NOSHORT:
 290                 if (dest_mode == 0)
 291                         /* Physical mode. */
 292                         result = kvm_apic_match_physical_addr(target, dest);
 293                 else
 294                         /* Logical mode. */
 295                         result = kvm_apic_match_logical_addr(target, dest);
 296                 break;
 297         case APIC_DEST_SELF:
 298                 result = (target == source);
 299                 break;
 300         case APIC_DEST_ALLINC:
 301                 result = 1;
 302                 break;
 303         case APIC_DEST_ALLBUT:
 304                 result = (target != source);
 305                 break;
 306         default:
 307                 printk(KERN_WARNING "Bad dest shorthand value %x\n",
 308                        short_hand);
 309                 break;
 310         }
 311
 312         return result;
 313 }
 314
 315 /*
 316  * Add a pending IRQ into lapic.
 317  * Return 1 if successfully added and 0 if discarded.
 318  */
 319 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 320                              int vector, int level, int trig_mode)
 321 {
 322         int result = 0;
 323         struct kvm_vcpu *vcpu = apic->vcpu;
 324
 325         switch (delivery_mode) {
 326         case APIC_DM_LOWEST:
 327                 vcpu->arch.apic_arb_prio++;
 328         case APIC_DM_FIXED:
 329                 /* FIXME add logic for vcpu on reset */
 330                 if (unlikely(!apic_enabled(apic)))
 331                         break;
 332
 333                 result = !apic_test_and_set_irr(vector, apic);
 334                 if (!result) {
 335                         if (trig_mode)
 336                                 apic_debug("level trig mode repeatedly for "
 337                                                 "vector %d", vector);
 338                         break;
 339                 }
 340
 341                 if (trig_mode) {
 342                         apic_debug("level trig mode for vector %d", vector);
 343                         apic_set_vector(vector, apic->regs + APIC_TMR);
 344                 } else
 345                         apic_clear_vector(vector, apic->regs + APIC_TMR);
 346                 kvm_vcpu_kick(vcpu);
 347                 break;
 348
 349         case APIC_DM_REMRD:
 350                 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
 351                 break;
 352
 353         case APIC_DM_SMI:
 354                 printk(KERN_DEBUG "Ignoring guest SMI\n");
 355                 break;
 356
 357         case APIC_DM_NMI:
 358                 result = 1;
 359                 kvm_inject_nmi(vcpu);
 360                 kvm_vcpu_kick(vcpu);
 361                 break;
 362
 363         case APIC_DM_INIT:
 364                 if (level) {
 365                         result = 1;
 366                         if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
 367                                 printk(KERN_DEBUG
 368                                        "INIT on a runnable vcpu %d\n",
 369                                        vcpu->vcpu_id);
 370                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
 371                         kvm_vcpu_kick(vcpu);
 372                 } else {
 373                         apic_debug("Ignoring de-assert INIT to vcpu %d\n",
 374                                    vcpu->vcpu_id);
 375                 }
 376                 break;
 377
 378         case APIC_DM_STARTUP:
 379                 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
 380                            vcpu->vcpu_id, vector);
 381                 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
 382                         result = 1;
 383                         vcpu->arch.sipi_vector = vector;
 384                         vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
 385                         kvm_vcpu_kick(vcpu);
 386                 }
 387                 break;
 388
 389         case APIC_DM_EXTINT:
 390                 /*
 391                  * Should only be called by kvm_apic_local_deliver() with LVT0,
 392                  * before NMI watchdog was enabled. Already handled by
 393                  * kvm_apic_accept_pic_intr().
 394                  */
 395                 break;
 396
 397         default:
 398                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
 399                        delivery_mode);
 400                 break;
 401         }
 402         return result;
 403 }
 404
 405 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
 406 {
 407         return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
 408 }
 409
 410 static void apic_set_eoi(struct kvm_lapic *apic)
 411 {
 412         int vector = apic_find_highest_isr(apic);
 413         int trigger_mode;
 414         /*
 415          * Not every write EOI will has corresponding ISR,
 416          * one example is when Kernel check timer on setup_IO_APIC
 417          */
 418         if (vector == -1)
 419                 return;
 420
 421         apic_clear_vector(vector, apic->regs + APIC_ISR);
 422         apic_update_ppr(apic);
 423
 424         if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
 425                 trigger_mode = IOAPIC_LEVEL_TRIG;
 426         else
 427                 trigger_mode = IOAPIC_EDGE_TRIG;
 428         kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
 429 }
 430
 431 static void apic_send_ipi(struct kvm_lapic *apic)
 432 {
 433         u32 icr_low = apic_get_reg(apic, APIC_ICR);
 434         u32 icr_high = apic_get_reg(apic, APIC_ICR2);
 435         struct kvm_lapic_irq irq;
 436
 437         irq.vector = icr_low & APIC_VECTOR_MASK;
 438         irq.delivery_mode = icr_low & APIC_MODE_MASK;
 439         irq.dest_mode = icr_low & APIC_DEST_MASK;
 440         irq.level = icr_low & APIC_INT_ASSERT;
 441         irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
 442         irq.shorthand = icr_low & APIC_SHORT_MASK;
 443         irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
 444
 445         apic_debug("icr_high 0x%x, icr_low 0x%x, "
 446                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
 447                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
 448                    icr_high, icr_low, irq.shorthand, irq.dest_id,
 449                    irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
 450                    irq.vector);
 451
 452         kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
 453 }
 454
 455 static u32 apic_get_tmcct(struct kvm_lapic *apic)
 456 {
 457         ktime_t remaining;
 458         s64 ns;
 459         u32 tmcct;
 460
 461         ASSERT(apic != NULL);
 462
 463         /* if initial count is 0, current count should also be 0 */
 464         if (apic_get_reg(apic, APIC_TMICT) == 0)
 465                 return 0;
 466
 467         remaining = hrtimer_expires_remaining(&apic->lapic_timer.timer);
 468         if (ktime_to_ns(remaining) < 0)
 469                 remaining = ktime_set(0, 0);
 470
 471         ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
 472         tmcct = div64_u64(ns,
 473                          (APIC_BUS_CYCLE_NS * apic->divide_count));
 474
 475         return tmcct;
 476 }
 477
 478 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
 479 {
 480         struct kvm_vcpu *vcpu = apic->vcpu;
 481         struct kvm_run *run = vcpu->run;
 482
 483         set_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests);
 484         run->tpr_access.rip = kvm_rip_read(vcpu);
 485         run->tpr_access.is_write = write;
 486 }
 487
 488 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
 489 {
 490         if (apic->vcpu->arch.tpr_access_reporting)
 491                 __report_tpr_access(apic, write);
 492 }
 493
 494 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
 495 {
 496         u32 val = 0;
 497
 498         KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
 499
 500         if (offset >= LAPIC_MMIO_LENGTH)
 501                 return 0;
 502
 503         switch (offset) {
 504         case APIC_ARBPRI:
 505                 printk(KERN_WARNING "Access APIC ARBPRI register "
 506                        "which is for P6\n");
 507                 break;
 508
 509         case APIC_TMCCT:        /* Timer CCR */
 510                 val = apic_get_tmcct(apic);
 511                 break;
 512
 513         case APIC_TASKPRI:
 514                 report_tpr_access(apic, false);
 515                 /* fall thru */
 516         default:
 517                 apic_update_ppr(apic);
 518                 val = apic_get_reg(apic, offset);
 519                 break;
 520         }
 521
 522         return val;
 523 }
 524
 525 static void apic_mmio_read(struct kvm_io_device *this,
 526                            gpa_t address, int len, void *data)
 527 {
 528         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 529         unsigned int offset = address - apic->base_address;
 530         unsigned char alignment = offset & 0xf;
 531         u32 result;
 532
 533         if ((alignment + len) > 4) {
 534                 printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
 535                        (unsigned long)address, len);
 536                 return;
 537         }
 538         result = __apic_read(apic, offset & ~0xf);
 539
 540         switch (len) {
 541         case 1:
 542         case 2:
 543         case 4:
 544                 memcpy(data, (char *)&result + alignment, len);
 545                 break;
 546         default:
 547                 printk(KERN_ERR "Local APIC read with len = %x, "
 548                        "should be 1,2, or 4 instead\n", len);
 549                 break;
 550         }
 551 }
 552
 553 static void update_divide_count(struct kvm_lapic *apic)
 554 {
 555         u32 tmp1, tmp2, tdcr;
 556
 557         tdcr = apic_get_reg(apic, APIC_TDCR);
 558         tmp1 = tdcr & 0xf;
 559         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
 560         apic->divide_count = 0x1 << (tmp2 & 0x7);
 561
 562         apic_debug("timer divide count is 0x%x\n",
 563                                    apic->divide_count);
 564 }
 565
 566 static void start_apic_timer(struct kvm_lapic *apic)
 567 {
 568         ktime_t now = apic->lapic_timer.timer.base->get_time();
 569
 570         apic->lapic_timer.period = apic_get_reg(apic, APIC_TMICT) *
 571                     APIC_BUS_CYCLE_NS * apic->divide_count;
 572         atomic_set(&apic->lapic_timer.pending, 0);
 573
 574         if (!apic->lapic_timer.period)
 575                 return;
 576         /*
 577          * Do not allow the guest to program periodic timers with small
 578          * interval, since the hrtimers are not throttled by the host
 579          * scheduler.
 580          */
 581         if (apic_lvtt_period(apic)) {
 582                 if (apic->lapic_timer.period < NSEC_PER_MSEC/2)
 583                         apic->lapic_timer.period = NSEC_PER_MSEC/2;
 584         }
 585
 586         hrtimer_start(&apic->lapic_timer.timer,
 587                       ktime_add_ns(now, apic->lapic_timer.period),
 588                       HRTIMER_MODE_ABS);
 589
 590         apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
 591                            PRIx64 ", "
 592                            "timer initial count 0x%x, period %lldns, "
 593                            "expire @ 0x%016" PRIx64 ".\n", __func__,
 594                            APIC_BUS_CYCLE_NS, ktime_to_ns(now),
 595                            apic_get_reg(apic, APIC_TMICT),
 596                            apic->lapic_timer.period,
 597                            ktime_to_ns(ktime_add_ns(now,
 598                                         apic->lapic_timer.period)));
 599 }
 600
 601 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
 602 {
 603         int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0));
 604
 605         if (apic_lvt_nmi_mode(lvt0_val)) {
 606                 if (!nmi_wd_enabled) {
 607                         apic_debug("Receive NMI setting on APIC_LVT0 "
 608                                    "for cpu %d\n", apic->vcpu->vcpu_id);
 609                         apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
 610                 }
 611         } else if (nmi_wd_enabled)
 612                 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
 613 }
 614
 615 static void apic_mmio_write(struct kvm_io_device *this,
 616                             gpa_t address, int len, const void *data)
 617 {
 618         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 619         unsigned int offset = address - apic->base_address;
 620         unsigned char alignment = offset & 0xf;
 621         u32 val;
 622
 623         /*
 624          * APIC register must be aligned on 128-bits boundary.
 625          * 32/64/128 bits registers must be accessed thru 32 bits.
 626          * Refer SDM 8.4.1
 627          */
 628         if (len != 4 || alignment) {
 629                 /* Don't shout loud, $infamous_os would cause only noise. */
 630                 apic_debug("apic write: bad size=%d %lx\n",
 631                            len, (long)address);
 632                 return;
 633         }
 634
 635         val = *(u32 *) data;
 636
 637         /* too common printing */
 638         if (offset != APIC_EOI)
 639                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
 640                            "0x%x\n", __func__, offset, len, val);
 641
 642         offset &= 0xff0;
 643
 644         KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
 645
 646         switch (offset) {
 647         case APIC_ID:           /* Local APIC ID */
 648                 apic_set_reg(apic, APIC_ID, val);
 649                 break;
 650
 651         case APIC_TASKPRI:
 652                 report_tpr_access(apic, true);
 653                 apic_set_tpr(apic, val & 0xff);
 654                 break;
 655
 656         case APIC_EOI:
 657                 apic_set_eoi(apic);
 658                 break;
 659
 660         case APIC_LDR:
 661                 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
 662                 break;
 663
 664         case APIC_DFR:
 665                 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
 666                 break;
 667
 668         case APIC_SPIV:
 669                 apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
 670                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
 671                         int i;
 672                         u32 lvt_val;
 673
 674                         for (i = 0; i < APIC_LVT_NUM; i++) {
 675                                 lvt_val = apic_get_reg(apic,
 676                                                        APIC_LVTT + 0x10 * i);
 677                                 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
 678                                              lvt_val | APIC_LVT_MASKED);
 679                         }
 680                         atomic_set(&apic->lapic_timer.pending, 0);
 681
 682                 }
 683                 break;
 684
 685         case APIC_ICR:
 686                 /* No delay here, so we always clear the pending bit */
 687                 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
 688                 apic_send_ipi(apic);
 689                 break;
 690
 691         case APIC_ICR2:
 692                 apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
 693                 break;
 694
 695         case APIC_LVT0:
 696                 apic_manage_nmi_watchdog(apic, val);
 697         case APIC_LVTT:
 698         case APIC_LVTTHMR:
 699         case APIC_LVTPC:
 700         case APIC_LVT1:
 701         case APIC_LVTERR:
 702                 /* TODO: Check vector */
 703                 if (!apic_sw_enabled(apic))
 704                         val |= APIC_LVT_MASKED;
 705
 706                 val &= apic_lvt_mask[(offset - APIC_LVTT) >> 4];
 707                 apic_set_reg(apic, offset, val);
 708
 709                 break;
 710
 711         case APIC_TMICT:
 712                 hrtimer_cancel(&apic->lapic_timer.timer);
 713                 apic_set_reg(apic, APIC_TMICT, val);
 714                 start_apic_timer(apic);
 715                 return;
 716
 717         case APIC_TDCR:
 718                 if (val & 4)
 719                         printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
 720                 apic_set_reg(apic, APIC_TDCR, val);
 721                 update_divide_count(apic);
 722                 break;
 723
 724         default:
 725                 apic_debug("Local APIC Write to read-only register %x\n",
 726                            offset);
 727                 break;
 728         }
 729
 730 }
 731
 732 static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
 733                            int len, int size)
 734 {
 735         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 736         int ret = 0;
 737
 738
 739         if (apic_hw_enabled(apic) &&
 740             (addr >= apic->base_address) &&
 741             (addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
 742                 ret = 1;
 743
 744         return ret;
 745 }
 746
 747 void kvm_free_lapic(struct kvm_vcpu *vcpu)
 748 {
 749         if (!vcpu->arch.apic)
 750                 return;
 751
 752         hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer);
 753
 754         if (vcpu->arch.apic->regs_page)
 755                 __free_page(vcpu->arch.apic->regs_page);
 756
 757         kfree(vcpu->arch.apic);
 758 }
 759
 760 /*
 761  *----------------------------------------------------------------------
 762  * LAPIC interface
 763  *----------------------------------------------------------------------
 764  */
 765
 766 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
 767 {
 768         struct kvm_lapic *apic = vcpu->arch.apic;
 769
 770         if (!apic)
 771                 return;
 772         apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
 773                      | (apic_get_reg(apic, APIC_TASKPRI) & 4));
 774 }
 775 EXPORT_SYMBOL_GPL(kvm_lapic_set_tpr);
 776
 777 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
 778 {
 779         struct kvm_lapic *apic = vcpu->arch.apic;
 780         u64 tpr;
 781
 782         if (!apic)
 783                 return 0;
 784         tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
 785
 786         return (tpr & 0xf0) >> 4;
 787 }
 788 EXPORT_SYMBOL_GPL(kvm_lapic_get_cr8);
 789
 790 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
 791 {
 792         struct kvm_lapic *apic = vcpu->arch.apic;
 793
 794         if (!apic) {
 795                 value |= MSR_IA32_APICBASE_BSP;
 796                 vcpu->arch.apic_base = value;
 797                 return;
 798         }
 799         if (apic->vcpu->vcpu_id)
 800                 value &= ~MSR_IA32_APICBASE_BSP;
 801
 802         vcpu->arch.apic_base = value;
 803         apic->base_address = apic->vcpu->arch.apic_base &
 804                              MSR_IA32_APICBASE_BASE;
 805
 806         /* with FSB delivery interrupt, we can restart APIC functionality */
 807         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
 808                    "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
 809
 810 }
 811
 812 u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu)
 813 {
 814         return vcpu->arch.apic_base;
 815 }
 816 EXPORT_SYMBOL_GPL(kvm_lapic_get_base);
 817
 818 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
 819 {
 820         struct kvm_lapic *apic;
 821         int i;
 822
 823         apic_debug("%s\n", __func__);
 824
 825         ASSERT(vcpu);
 826         apic = vcpu->arch.apic;
 827         ASSERT(apic != NULL);
 828
 829         /* Stop the timer in case it's a reset to an active apic */
 830         hrtimer_cancel(&apic->lapic_timer.timer);
 831
 832         apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
 833         apic_set_reg(apic, APIC_LVR, APIC_VERSION);
 834
 835         for (i = 0; i < APIC_LVT_NUM; i++)
 836                 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
 837         apic_set_reg(apic, APIC_LVT0,
 838                      SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
 839
 840         apic_set_reg(apic, APIC_DFR, 0xffffffffU);
 841         apic_set_reg(apic, APIC_SPIV, 0xff);
 842         apic_set_reg(apic, APIC_TASKPRI, 0);
 843         apic_set_reg(apic, APIC_LDR, 0);
 844         apic_set_reg(apic, APIC_ESR, 0);
 845         apic_set_reg(apic, APIC_ICR, 0);
 846         apic_set_reg(apic, APIC_ICR2, 0);
 847         apic_set_reg(apic, APIC_TDCR, 0);
 848         apic_set_reg(apic, APIC_TMICT, 0);
 849         for (i = 0; i < 8; i++) {
 850                 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
 851                 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
 852                 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
 853         }
 854         update_divide_count(apic);
 855         atomic_set(&apic->lapic_timer.pending, 0);
 856         if (vcpu->vcpu_id == 0)
 857                 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
 858         apic_update_ppr(apic);
 859
 860         vcpu->arch.apic_arb_prio = 0;
 861
 862         apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
 863                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
 864                    vcpu, kvm_apic_id(apic),
 865                    vcpu->arch.apic_base, apic->base_address);
 866 }
 867 EXPORT_SYMBOL_GPL(kvm_lapic_reset);
 868
 869 bool kvm_apic_present(struct kvm_vcpu *vcpu)
 870 {
 871         return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
 872 }
 873
 874 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
 875 {
 876         return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
 877 }
 878 EXPORT_SYMBOL_GPL(kvm_lapic_enabled);
 879
 880 /*
 881  *----------------------------------------------------------------------
 882  * timer interface
 883  *----------------------------------------------------------------------
 884  */
 885
 886 static bool lapic_is_periodic(struct kvm_timer *ktimer)
 887 {
 888         struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic,
 889                                               lapic_timer);
 890         return apic_lvtt_period(apic);
 891 }
 892
 893 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
 894 {
 895         struct kvm_lapic *lapic = vcpu->arch.apic;
 896
 897         if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
 898                 return atomic_read(&lapic->lapic_timer.pending);
 899
 900         return 0;
 901 }
 902
 903 static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
 904 {
 905         u32 reg = apic_get_reg(apic, lvt_type);
 906         int vector, mode, trig_mode;
 907
 908         if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
 909                 vector = reg & APIC_VECTOR_MASK;
 910                 mode = reg & APIC_MODE_MASK;
 911                 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
 912                 return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
 913         }
 914         return 0;
 915 }
 916
 917 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
 918 {
 919         struct kvm_lapic *apic = vcpu->arch.apic;
 920
 921         if (apic)
 922                 kvm_apic_local_deliver(apic, APIC_LVT0);
 923 }
 924
 925 static struct kvm_timer_ops lapic_timer_ops = {
 926         .is_periodic = lapic_is_periodic,
 927 };
 928
 929 int kvm_create_lapic(struct kvm_vcpu *vcpu)
 930 {
 931         struct kvm_lapic *apic;
 932
 933         ASSERT(vcpu != NULL);
 934         apic_debug("apic_init %d\n", vcpu->vcpu_id);
 935
 936         apic = kzalloc(sizeof(*apic), GFP_KERNEL);
 937         if (!apic)
 938                 goto nomem;
 939
 940         vcpu->arch.apic = apic;
 941
 942         apic->regs_page = alloc_page(GFP_KERNEL);
 943         if (apic->regs_page == NULL) {
 944                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
 945                        vcpu->vcpu_id);
 946                 goto nomem_free_apic;
 947         }
 948         apic->regs = page_address(apic->regs_page);
 949         memset(apic->regs, 0, PAGE_SIZE);
 950         apic->vcpu = vcpu;
 951
 952         hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
 953                      HRTIMER_MODE_ABS);
 954         apic->lapic_timer.timer.function = kvm_timer_fn;
 955         apic->lapic_timer.t_ops = &lapic_timer_ops;
 956         apic->lapic_timer.kvm = vcpu->kvm;
 957         apic->lapic_timer.vcpu_id = vcpu->vcpu_id;
 958
 959         apic->base_address = APIC_DEFAULT_PHYS_BASE;
 960         vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
 961
 962         kvm_lapic_reset(vcpu);
 963         apic->dev.read = apic_mmio_read;
 964         apic->dev.write = apic_mmio_write;
 965         apic->dev.in_range = apic_mmio_range;
 966         apic->dev.private = apic;
 967
 968         return 0;
 969 nomem_free_apic:
 970         kfree(apic);
 971 nomem:
 972         return -ENOMEM;
 973 }
 974 EXPORT_SYMBOL_GPL(kvm_create_lapic);
 975
 976 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
 977 {
 978         struct kvm_lapic *apic = vcpu->arch.apic;
 979         int highest_irr;
 980
 981         if (!apic || !apic_enabled(apic))
 982                 return -1;
 983
 984         apic_update_ppr(apic);
 985         highest_irr = apic_find_highest_irr(apic);
 986         if ((highest_irr == -1) ||
 987             ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
 988                 return -1;
 989         return highest_irr;
 990 }
 991
 992 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
 993 {
 994         u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
 995         int r = 0;
 996
 997         if (vcpu->vcpu_id == 0) {
 998                 if (!apic_hw_enabled(vcpu->arch.apic))
 999                         r = 1;
1000                 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1001                     GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1002                         r = 1;
1003         }
1004         return r;
1005 }
1006
1007 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1008 {
1009         struct kvm_lapic *apic = vcpu->arch.apic;
1010
1011         if (apic && atomic_read(&apic->lapic_timer.pending) > 0) {
1012                 if (kvm_apic_local_deliver(apic, APIC_LVTT))
1013                         atomic_dec(&apic->lapic_timer.pending);
1014         }
1015 }
1016
1017 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1018 {
1019         int vector = kvm_apic_has_interrupt(vcpu);
1020         struct kvm_lapic *apic = vcpu->arch.apic;
1021
1022         if (vector == -1)
1023                 return -1;
1024
1025         apic_set_vector(vector, apic->regs + APIC_ISR);
1026         apic_update_ppr(apic);
1027         apic_clear_irr(vector, apic);
1028         return vector;
1029 }
1030
1031 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1032 {
1033         struct kvm_lapic *apic = vcpu->arch.apic;
1034
1035         apic->base_address = vcpu->arch.apic_base &
1036                              MSR_IA32_APICBASE_BASE;
1037         apic_set_reg(apic, APIC_LVR, APIC_VERSION);
1038         apic_update_ppr(apic);
1039         hrtimer_cancel(&apic->lapic_timer.timer);
1040         update_divide_count(apic);
1041         start_apic_timer(apic);
1042 }
1043
1044 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1045 {
1046         struct kvm_lapic *apic = vcpu->arch.apic;
1047         struct hrtimer *timer;
1048
1049         if (!apic)
1050                 return;
1051
1052         timer = &apic->lapic_timer.timer;
1053         if (hrtimer_cancel(timer))
1054                 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1055 }
1056
1057 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1058 {
1059         u32 data;
1060         void *vapic;
1061
1062         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1063                 return;
1064
1065         vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1066         data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1067         kunmap_atomic(vapic, KM_USER0);
1068
1069         apic_set_tpr(vcpu->arch.apic, data & 0xff);
1070 }
1071
1072 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1073 {
1074         u32 data, tpr;
1075         int max_irr, max_isr;
1076         struct kvm_lapic *apic;
1077         void *vapic;
1078
1079         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1080                 return;
1081
1082         apic = vcpu->arch.apic;
1083         tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1084         max_irr = apic_find_highest_irr(apic);
1085         if (max_irr < 0)
1086                 max_irr = 0;
1087         max_isr = apic_find_highest_isr(apic);
1088         if (max_isr < 0)
1089                 max_isr = 0;
1090         data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1091
1092         vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1093         *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1094         kunmap_atomic(vapic, KM_USER0);
1095 }
1096
1097 void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1098 {
1099         if (!irqchip_in_kernel(vcpu->kvm))
1100                 return;
1101
1102         vcpu->arch.apic->vapic_addr = vapic_addr;
1103 }